Privessa

Scan Enhancement

Turn a phone photo of a document into something that looks like a flatbed scan.

Image tools Client-side Canvas filters

Tool preview

How to use it

  1. 01

    Drop the photo.

  2. 02

    Adjust contrast, brightness and grayscale.

  3. 03

    Enhance and download.

Limitations

FAQ

What settings work best for text documents?

Contrast around 1.4 and a little brightness lift, with slight grayscale for fax-like output.

Does it remove shadows?

Partially, through contrast; it is not a dedicated shadow removal model.

Is the photo uploaded?

No.

Files never leave your device

Processing happens in your browser using the File API, WebAssembly and Web Workers. There is no upload endpoint.

Technical details

Processing
Client-side
Implementation
Canvas filters
Category
Image tools
Network requests
None while processing

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